Jane was shy. She would not invite her classmates____speaking English.
读课文《伤仲永》,方仲永由天资过人变得“泯然众人”,原因是____。
—__________. Let's meet at the movie theater.
人的胚胎干细胞有46条染色体,以色列科学家利用胚胎干细胞成功的制造出了心脏细胞,请问,制造出的心脏细胞有多少条染色体?( )